Class d amplifier with switching control

H - Electricity – 03 – F

Patent

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Details

H03F 3/38 (2006.01) H03F 1/02 (2006.01) H03F 3/217 (2006.01)

Patent

CA 2299333

A class D amplifier utilizing first and second switches (22, 24) connected in series to conduct current from a common source in a sequential manner. The switches have a common output note between them. A pulse width modulator (16) is utilized to produce first and second signals (70, 76) identified as the high and low side. The first switch connects to a drive which receives the first signal from the pulse width modulator to close the first switch. A second switch drive receives a second signal from the pulse width modulator to operate the second switch in a sequential manner. A toggle or commutator device utilizes third and fourth switches (44, 46) in series with an inductor. The toggle device is connected to the common node between the first and second swithces in order to closely control the switching of the first and second switches to eliminate loss of energy associated with the rapid switching normally found in a class D amplifier.

L'invention concerne un amplificateur classe D utilisant un premier et un second commutateurs (22, 24) reliés en série pour conduire le courant, de manière séquentielle, à partir d'une source commune. Les commutateurs possèdent, entre eux, un noeud de sortie commun. Un modulateur (16) de largeur d'impulsion est utilisé pour produire un premier et un second signaux (70, 76) identifiés comme côté haut et côté bas. Le premier commutateur est connecté à un pilote qui, à la réception du premier signal en provenance du modulateur de largeur d'impulsion, ferme le premier commutateur. Un second pilote du commutateur fait fonctionner le second commutateur de manière séquentielle à la réception d'un second signal en provenance du modulateur de largeur d'impulsion. Un inverseur ou un commutateur utilise un troisième et un quatrième commutateurs (44, 46) montés en série avec un inducteur. L'inverseur est connecté au noeud commun situé entre le premier et le second commutateurs de manière à commander au plus près la commutation du premier et du second commutateurs afin d'éliminer les pertes d'énergie se rencontrant normalement dans les amplificateurs de classe D à commutation rapide.

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